netdev - Re: sctp use-uninitialized warning in net-2.6.25

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Date:	Sun, 20 Jan 2008 05:47:13 -0500
From:	Vlad Yasevich <vyasevich@...izon.net>
To:	David Miller <davem@...emloft.net>
Cc:	akpm@...ux-foundation.org, netdev@...r.kernel.org
Subject: Re: sctp use-uninitialized warning in net-2.6.25

David Miller wrote:
> From: Vlad Yasevich <vladislav.yasevich@...com>
> Date: Fri, 18 Jan 2008 21:17:56 -0500
> 
>> Hmm... in the code I am looking at, it's set in both zero and
>> non-zero cases so it does solve the issue.
>>
>> So does initializing it to NO_ERROR like you did.
> 
> Here is the code block in question in net-2.6.25:
> 
> 	/* Verify the INIT chunk before processing it. */
> 	err_chunk = NULL;
> 	if (!sctp_verify_init(asoc, chunk->chunk_hdr->type,
> 			      (sctp_init_chunk_t *)chunk->chunk_hdr, chunk,
> 			      &err_chunk)) {
>  ...
> 		if (err_chunk) {
>  ...
> 			if (packet) {
> 				sctp_add_cmd_sf(commands, SCTP_CMD_SEND_PKT,
> 						SCTP_PACKET(packet));
> 				SCTP_INC_STATS(SCTP_MIB_OUTCTRLCHUNKS);
> 				error = SCTP_ERROR_INV_PARAM;
> 			} else {
> 				error = SCTP_ERROR_NO_RESOURCE;
> 			}
> 		}
>  ...
> 		return sctp_stop_t1_and_abort(commands, error, ECONNREFUSED,
> 						asoc, chunk->transport);
> 
> If err_chunk == NULL at the "if (err_chunk)" test, error
> will be left uninitialized, even after being moved as you
> have suggested (right after the sctp_verify_init() call).
> 
> Thanks.
> 

Hi David

Thanks for beating into my thick scull that this is in 2.6.25.  I missed that
initially.

Anyway, here is a patch that sets the correct value.

-vlad

View attachment "0001-SCTP-Correctly-initialize-error-when-parameter-val.patch" of type "text/x-patch" (1822 bytes)